Effects of low temperature stress in seedling stage on growth development and yield for maize
Two maize cultivars (Danyu 39 ,Danyu 42 ) with low temperature stress in seedling stage were measured . This paper analyzed the growth characteristics and yield of different treatments and their response to low temperature stress in seedling stage .The results showed as follows .(1 ) From three leaf period to seven leaf period ,the growth of leaf area was inhibited during the low temperature treatment periods ,and the effects on Danyu 39 were greater than those of Danyu 42 .(2) From the jointing stage to the milky stage ,the leaf area of Danyu 39 increased gradually with growth and eventu-ally reached the control levels in the milky stage .Compared with Danyu 39 ,the recovery ability of Danyu 42 was low during the whole growing stage .(3 ) There were effects of low temperature stress on Danyu 42 ,leading to longer seedling stage and shorter ear stage .But the effects on Danyu 39 were unclear .(4) Compared with the controls ,the ear length , ear diameter ,stem weight ,grain weight and 100-seed weight of Danyu 42 in low temperature treatments were all de-creased .However ,the effects on Danyu 39 were small .
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维普
